<template>
    <div>
        <!-- 面包屑导航区域 -->
        <el-breadcrumb separator-class="el-icon-arrow-right">
            <el-breadcrumb-item :to="{ path: '/home' }">首页</el-breadcrumb-item>
            <el-breadcrumb-item>商品管理</el-breadcrumb-item>
            <el-breadcrumb-item>参数列表</el-breadcrumb-item>
        </el-breadcrumb>
        <!-- 卡片式图区域 -->
        <el-card>
            <!-- 头部警告区域 -->
            <el-alert title="注意：只允许为第三级分类设置相关参数！" type="warning" :closable="false" show-icon></el-alert>
            <!-- 选择商品分类区域 -->
            <el-row class="cat_opt">
                <el-col>
                    <span>选择商品分类：</span>
                    <!-- 选择商品分类的级联选择框 -->
                    <!-- 没渲染出来，看P117课 -->
                    <el-cascader v-model="selectedCateKeys" :options="cateList" :props="cateProps" @change="handleChange" expand-trigger="hover"></el-cascader>
                </el-col>
            </el-row>
            <!-- teb 页签区域 -->
            <el-tabs v-model="activeName" @tab-click="handleTebClick">
                <!-- 添加动态参数的面板 -->
                <el-tab-pane label="动态参数" name="many">
                    <el-button type='primary' size='mini' :disabled="isBtnDisabled" @click="addDialogVisible=true">添加参数</el-button>
                    <!-- 动态参数表格 -->
                    <el-table :data='manyTableDate' border stripe>
                        <!-- 展开行 -->
                        <el-table-column type='expand'>
                            <template v-slot:default="scope">
                                <!--  循环渲染tag标签 -->
                                <el-tag closable v-for="(item, i) in scope.row.attr_vals" :key="i" @close="handelClose(i, scope.row)">
                                    {{item}}
                                </el-tag>
                                <!-- 输入的文本框 -->
                                <el-input class="input-new-tag" v-if="scope.row.inputVisible" v-model="scope.row.inputValue" ref="saveTagInput" size="small" @keyup.enter.native="handleInputConfirm(scope.row)" @blur="handleInputConfirm(scope.row)">
                                </el-input>
                                <!-- 添加的按钮 -->
                                <el-button v-else class="button-new-tag" size="small" @click="showInput(scope.row)">+ New Tag</el-button>
                            </template>
                        </el-table-column>
                        <!-- 索引列 -->
                        <el-table-column type='index'></el-table-column>
                        <el-table-column lebal='参数名称' prop='attr_name'></el-table-column>
                        <el-table-column lebal='操作'>
                            <template v-slot:default="scope">
                                <el-button type="primary" icon="el-icon-edit" size='mini' @click="showEditDialog(scope.row.attr_id)">编辑</el-button>
                                <el-button type="danger" icon="el-icon-delete" size='mini' @click="removeParams(scope.row.attr_id)">删除</el-button>
                            </template>
                        </el-table-column>
                    </el-table>
                </el-tab-pane>
                <!-- 添加静态属性的面板 -->
                <el-tab-pane label="静态属性" name="only">
                    <el-button type='primary' size='mini' :disabled="isBtnDisabled" @click="addDialogVisible=true">添加属性</el-button>
                    <!-- 静态属性表格 -->
                    <el-table :data='onlyTableDate' border stripe>
                        <!-- 展开行 -->
                        <el-table-column type='expand'>
                            <template v-slot:default="scope">
                                <!--  循环渲染tag标签 -->
                                <el-tag closable v-for="(item, i) in scope.row.attr_vals" :key="i" @close="handelClose(i, scope.row)">
                                    {{item}}
                                </el-tag>
                                <!-- 输入的文本框 -->
                                <el-input class="input-new-tag" v-if="scope.row.inputVisible" v-model="scope.row.inputValue" ref="saveTagInput" size="small" @keyup.enter.native="handleInputConfirm(scope.row)" @blur="handleInputConfirm(scope.row)">
                                </el-input>
                                <!-- 添加的按钮 -->
                                <el-button v-else class="button-new-tag" size="small" @click="showInput(scope.row)">+ New Tag</el-button>
                            </template>
                        </el-table-column>
                        <!-- 索引列 -->
                        <el-table-column type='index'></el-table-column>
                        <el-table-column lebal='属性名称' prop='attr_name'></el-table-column>
                        <el-table-column lebal='操作'>
                            <template>
                                <el-button type="primary" icon="el-icon-edit" size='mini' @click="showEditDialog">编辑</el-button>
                                <el-button type="danger" icon="el-icon-delete" size='mini' @click="showDeleteDialog">删除</el-button>
                            </template>
                        </el-table-column>
                    </el-table>
                </el-tab-pane>
            </el-tabs>
        </el-card>
        <!-- 添加参数/属性的对话框 -->
        <el-dialog :title="'添加' + titleText" :visible.sync="addDialogVisible" width="50%" @close="addDialogClosed">
            <!-- 添加参数/属性的对话框 -->
            <el-form ref="addFormRef" :model="addForm" label-width="100px" :rules="addFormRules">
                <el-form-item :label="titleText" prop="attr_name">
                    <el-input v-model="addForm.attr_name"></el-input>
                </el-form-item>
            </el-form>
            <span slot="footer" class="dialog-footer">
                <el-button @click="addDialogVisible = false">取 消</el-button>
                <el-button type="primary" @click="addParams">确 定</el-button>
            </span>
        </el-dialog>
        <!-- 修改参数/属性的对话框 -->
        <el-dialog :title="'修改' + titleText" :visible.sync="editDialogVisible" width="50%" @close="editDialogClosed">
            <!-- 添加参数/属性的对话框 -->
            <el-form ref="editFormRef" :model="editForm" label-width="100px" :rules="editFormRules">
                <el-form-item :label="titleText" prop="attr_name">
                    <el-input v-model="editForm.attr_name"></el-input>
                </el-form-item>
            </el-form>
            <span slot="footer" class="dialog-footer">
                <el-button @click="editDialogVisible = false">取 消</el-button>
                <el-button type="primary" @click="editParams">确 定</el-button>
            </span>
        </el-dialog>
    </div>
</template>

<script>
export default {
  data () {
    return {
      // 商品分类列表
      cateList: [],
      // 级联选择框的配置对象
      cateProps: {
        value: 'cat_id',
        lebal: 'cat_name',
        children: 'children'
      },
      // 级联选择框双向绑定到的数组
      selectedCateKeys: [],
      // 被激活的页签名称
      activeName: 'many',
      // 动态参数数据
      manyTableDate: [],
      // 静态属性数据
      onlyTableDate: [],
      // 控制添加参数对话框的显示与隐藏
      addDialogVisible: false,
      // 添加参数表单的数据对象
      addForm: {
        attr_name: ''
      },
      // 添加表单的验证规则对象
      addFormRules: {
        attr_name: [
          { required: true, message: '请输入参数名称', trigger: 'blur' }
        ]
      },
      // 控制修改参数对话框的显示与隐藏
      editDialogVisible: false,
      // 修改表单参数数据对象
      editForm: {},
      // 修改表单的验证规则对象
      editFormRules: {
        attr_name: [
          { required: true, message: '请输入参数名称', trigger: 'blur' }
        ]
      }
    }
  },
  created () {
    this.getCateList()
  },
  methods: {
    // 获取所有商品分类
    async getCateList () {
      const { data: res } = await this.$http.get('categories')
      if (res.meta.status !== 200) {
        return this.$message.error('获取分类列表失败！')
      }
      this.cateList = res.data
      console.log(this.cateList)
    },
    // 级联选择框选中项变化的时候，会触发这个函数
    handleChange () {
      this.getParamsData()
    },
    // Teb 页签点击事件的处理函数
    handleTebClick () {
      console.log(this.activeName)
      this.getParamsData()
    },
    // 获取参数的列表数据
    async getParamsData () {
      // 验证选中的是否为三级分类
      if (this.selectedCateKeys.length !== 3) {
        // 此时不是三级分类，要清空数组
        this.selectedCateKeys = []
        this.manyTableDate = []
        this.onlyTableDate = []
        return
      }
      // 此时是三级分类
      console.log(this.selectedCateKeys)
      // 根据所选参数的ID和当前所处的面板，获取对应的参数
      const { data: res } = await this.$http.get(`categories/${this.cateId}/attributes`, { params: { sel: this.activeName } })
      if (res.meta.status !== 200) {
        return this.$message.error('获取参数列表失败！')
      }
      res.data.forEach(item => {
        item.attr_vals = item.attr_vals ? item.attr_vals.split(',') : []
        // 控制文本框的显示与隐藏
        item.inputVisible = false
        // 文本框输入的内容
        item.inputValue = ''
      })
      console.log(res.data)
      if (this.activeName === 'many') {
        this.manyTableDate = res.data
      }
      this.onlyTableDate = res.data
    },
    // 监听对话框的关闭事件
    addDialogClosed () {
      this.$refs.addFormRef.resetFields()
    },
    // 点击按钮，添加参数
    addParams () {
      this.$refs.addFormRef.validate(async valid => {
        if (!valid) {
          return
        }
        const { data: res } = await this.$http.post(`categories/${this.cateId}/attributes`, { attr_name: this.addForm.attr_name, attr_sel: this.activeName })
        if (res.meta.status !== 201) {
          this.$message.error('添加参数失败！')
        }
        this.$message.success('添加参数成功！')
        this.addDialogVisible = false
        this.getParamsData()
      })
    },
    // 点击按钮弹出编辑对话框
    showEditDialog () {
      this.editDialogVisible = true
    },
    // 点击按钮弹出删除对话框
    async showDeleteDialog (attrId) {
      // 查询当前参数的信息
      const { data: res } = await this.$http.get(`categories/${this.cateId}/attributes/${attrId}`, { params: { attr_sel: this.activeName } })
      if (res.meta.status !== 200) {
        this.$message.error('查询参数失败！')
      }
      this.editForm = res.data
      this.editDialogVisible = true
    },
    // 修改参数对话框关闭，重置修改的表单
    editDialogClosed () {
      this.$refs.editFormRef.resetFields()
    },
    // 点击按钮,确认参数的修改
    editParams () {
      this.$refs.editFormRef.validate(async valid => {
        if (!valid) {
          return
        }
        const { data: res } = await this.$http.put(`categories/${this.cateId}/attributes/${this.editForm.attr_id}`, { attr_name: this.editForm.attr_name, attr_sel: this.activeName })
        if (res.meta.status !== 200) {
          this.$message.error('修改参数失败！')
        }
        this.$message.success('修改参数成功！')
        this.getParamsData()
        this.editDialogVisible = false
      })
    },
    // 根据ID删除对应参数的处理函数
    async removeParams (attrId) {
      const confirmResult = await this.$confirm('此操作将永久删除该参数, 是否继续?', '提示', {
        confirmButtonText: '确定',
        cancelButtonText: '取消',
        type: 'warning'
      }).catch(err => err)
      // 根据返回值判断用户是否确认删除
      if (confirmResult !== 'confirm') {
        // 用户取消了删除操作
        this.$message.error('已取消删除参数！')
      }
      const { data: res } = await this.$http.delete(`categories/${this.cateId}/attributes/${attrId}`)
      if (res.meta.status !== 200) {
        return this.$message.error('删除参数失败！')
      }
      this.$message.success('删除参数成功！')
      this.getParamsData()
    },
    // 文本框失去焦点 或 按下enter键时 触发
    async handleInputConfirm (row) {
      // 判断用户是否输入了内容
      if (row.inputValue.trim().length === 0) {
        // 没有输入内容，清空并关闭
        row.inputValue = ''
        row.inputVisible = false
      }
      // 用户输入了内容，进行后续处理
      row.attr_vals.push(row.inputValue.trim())
      row.inputValue = ''
      row.inputVisible = false
      // 将数据保存
      this.saveAttrVals(row)
    },
    // 点击按钮显示文本输入框
    showInput (row) {
      row.inputVisible = true
      // 让文本框自动获取焦点
      // $nextTick 的作用是当页面上的元素重新渲染之后回调内部的函数
      this.$nextTick(_ => {
        this.$refs.saveTagInput.$refs.input.focus()
      })
    },
    // 将添加的attr_vals内容保存到数据库中
    async saveAttrVals (row) {
      const { data: res } = await this.$http.put(`categories/${this.cateId}/attributes/${row.attr_id}`, { attr_name: row.attr_name, attr_sel: row.attr_sel, attr_vals: row.attr_vals.join(',') })
      if (res.meta.status !== 200) {
        return this.$message.error('添加参数失败！')
      }
      this.$message.success('添加参数成功！')
    },
    // 删除对应的参数可选项
    handelClose (i, row) {
      row.attr_vals.splice(i, 1)
      this.saveAttrVals(row)
    }
  },
  computed: {
    // 如果按钮需要被禁用，则返回true，否则返回false
    isBtnDisabled () {
      if (this.selectedCateKeys.length !== 3) {
        return true
      }
      return false
    },
    // 当前选中的三级分类的ID
    cateId () {
      if (this.selectedCateKeys.length === 3) {
        return this.selectedCateKeys[2]
      }
      return null
    },
    // 动态计算标题的文本
    titleText () {
      if (this.activeName === 'many') {
        return '动态参数'
      }
      return '静态属性'
    }
  }
}
</script>

<style lang="less" scoped>
.cat_opt{
    margin: 15px 0px;
}
.el-tag{
    margin: 10px;
}
.input-new-tag{
    width: 120px;
}
</style>
